Volvo S40 Shakes

For Sometime Now When Driving And Slows Down, My Car Shakes Until I Push The Clutch Down. And The Engine Is Idle You Still Hear The Engine...

But Only If You Press On Gas,when You Let Off The Gas Pedal It Runs Perfectly. Car Is Shaking While Driving On The Freeway,on Lower Speed...

My Car Shakes When Running In Park,when I'm Driving It Shakes.but When I Hit The Brakes Are Applied It Stops Shaking